Hebrews 4:12
12 For wthe word of God is living and xactive, ysharper than any ztwo-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and adiscerning the thoughts and intentions of the heart.
Hebrews 8:10
10 hFor this is the covenant that I will make with the house of Israel
after those days, declares the Lord:
I will put my laws into their minds,
and iwrite them on their hearts,
and I will be their God,
and they shall be my people.